US10224777B2 - Brushless motor with water stopping walls creating labyrinth structure - Google Patents

Brushless motor with water stopping walls creating labyrinth structure Download PDF

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Publication number
US10224777B2
US10224777B2 US15/059,309 US201615059309A US10224777B2 US 10224777 B2 US10224777 B2 US 10224777B2 US 201615059309 A US201615059309 A US 201615059309A US 10224777 B2 US10224777 B2 US 10224777B2
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Prior art keywords
water stopping
stopping wall
motor shaft
ring
labyrinth structure
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US15/059,309
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US20160268863A1 (en
Inventor
Akio MURASE
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Denso Corp
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Denso Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/12—Machines characterised by the bobbins for supporting the windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/325—Windings characterised by the shape, form or construction of the insulation for windings on salient poles, such as claw-shaped poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders

Definitions

  • the present disclosure relates to a brushless motor.
  • a conventional outer rotor type brushless motor provided with a motor shaft, a rotor housing rotatably supported on the motor shaft through a shaft bearing, and a stator housed inside the rotor housing is known (for example, see Japanese Patent Application Laid-Open (JP-A) No. 2014-36525).
  • This vehicle fan motor is fixed to the vehicle body by a shroud.
  • a fixing portion provided at a central portion of a fan is fixed to a rotor housing in this fan motor, and the fan rotates together with the rotor housing.
  • the present disclosure provides a brushless motor capable of securing cooling of the winding coil section while suppressing the shaft bearing from being exposed to water.
  • a first aspect of the present disclosure is a brushless motor including: a motor shaft; a rotor housing including a circular cylinder shaped shaft bearing housing section provided at the radial direction outside of the motor shaft, and an outer cylinder section formed at the radial direction outside of the shaft bearing housing section; a shaft bearing that is housed in the shaft bearing housing section, and that is assembled to the motor shaft; a stator core that includes a ring-shaped unit provided at the radial direction outside of the shaft bearing housing section, and plural teeth formed in a radiating pattern at the periphery of the ring-shaped unit, and that is housed inside the outer cylinder section; an insulator that includes a ring-shaped insulating portion covering the ring-shaped unit, and plural teeth insulating portions respectively covering the plural teeth; plural winding coil portions wound around the teeth and over the teeth insulating portions; a centerpiece that includes a main body section disposed facing an opening of the outer cylinder section, and that supports the motor shaft and the stator core; a first water
  • a labyrinth structure is configured by the first water stopping wall and the second water stopping wall that are formed in ring shapes along the circumferential direction of the motor shaft.
  • the first water stopping wall extends out along the axial direction of the motor shaft from the ring-shaped insulating portion toward the main body section
  • the second water stopping wall extends out along the axial direction of the motor shaft from the main body section toward the ring-shaped insulating portion.
  • the labyrinth structure is positioned at the radial direction inside of the plural winding coil portions that are arranged in a ring shape. Accordingly, since the labyrinth structure is not disposed on the pathway of the flow of cooling wind that cools the winding coil sections and that is expelled toward the radial direction outside of the brushless motor, the flow of the cooling wind can be suppressed from being hindered by the labyrinth structure.
  • a second aspect of the present disclosure is the brushless motor of the first aspect, wherein the first water stopping wall is disposed at the radial direction inside of the second water stopping wall.
  • the first water stopping wall is disposed at a closer position to the outer peripheral face of the motor shaft (the outer peripheral face of the motor shaft along which water droplets travel) that is liable to become the pathway by which water droplets penetrate to the shaft bearing. Accordingly, the shaft bearing can be more effectively suppressed from being exposed to water by the first water stopping wall.
  • a third aspect of the present disclosure is the brushless motor of the second aspect, wherein an extending portion is formed at the ring-shaped insulating portion so as to extend out toward the radial direction outside of the first water stopping wall, and a leading end portion of the second water stopping wall faces the extending portion along the axial direction of the motor shaft.
  • the brushless motor of the third aspect due to the extending portion formed at the ring-shaped insulating portion and the leading end portion of the second water stopping wall facing each other along the axial direction of the motor shaft, water droplets cannot easily enter the gap between the extending portion and the leading end portion of the second water stopping wall.
  • the water stopping capability of the labyrinth structure can thereby be improved.
  • a fourth aspect of the present disclosure is the brushless motor of the third aspect, wherein a radial direction outside end portion of the extending portion projects out further to the radial direction outside of the extending portion than the leading end portion of the second water stopping wall.
  • a radial direction outside end portion of the extending portion projects further toward the radial direction outside of the extending portion than the leading end portion of the second water stopping wall. Accordingly, since water droplets can be more effectively hindered at the portion of the extending portion projecting further toward the radial direction outside than the second water stopping wall, this can also improve the water stopping capability of the labyrinth structure.
  • a fifth aspect of the present disclosure is the brushless motor of any one of the first aspect to the fourth aspect, further including: a third water stopping wall that is formed in a ring shape along the circumferential direction of the motor shaft, and that extends out along the axial direction of the motor shaft from the ring-shaped insulating portion toward the main body section; and a fourth water stopping wall that is formed in a ring shape along the circumferential direction of the motor shaft, and that extends out along the axial direction of the motor shaft from the main body section toward the ring-shaped insulating portion, wherein, the first water stopping wall and the second water stopping wall configure an inner labyrinth structure as the labyrinth structure, and the third water stopping wall and the fourth water stopping wall configure an outer labyrinth structure positioned at the radial direction inside of plural winding coil portions and at the radial direction outside of the inner labyrinth structure.
  • the outer labyrinth structure is also provided at the radial direction inside of the plural winding coil sections. Accordingly, the shaft bearings can be even more effectively suppressed from being exposed to water by this two-layer labyrinth structure.
  • the outer labyrinth structure is also positioned at the radial direction inside of the plural winding coil sections arranged in a ring shape. Accordingly, since the outer labyrinth structure is not disposed on the pathway of the flow of cooling wind that cools the winding coil sections and that is expelled to toward the radial direction outside of the brushless motor, the flow of the cooling wind can be suppressed from being hindered by the outer labyrinth structure.
  • a sixth aspect of the present disclosure is the brushless motor of the fifth aspect, wherein the leading end side of the first water stopping wall overlaps along the axial direction of the motor shaft with the leading end side of the second water stopping wall, and the leading end side of the third water stopping wall overlaps along the axial direction of the motor shaft with the leading end side of the fourth water stopping wall.
  • the leading end side of the first water stopping wall overlaps with the leading end side of the second water stopping wall along the axial direction of the motor shaft.
  • the water stopping capability of the inner labyrinth structure can thereby be further improved since the flow path inside the inner labyrinth structure bends and the flow path length is increased.
  • the leading end side of the third water stopping wall overlaps with the leading end side of the fourth water stopping wall of the motor shaft.
  • the water stopping capability of the outer labyrinth structure can thereby be further improved since the flow path inside the outer labyrinth structure bends and the flow path length is increased.
  • FIG. 1 is a vertical cross-section of a brushless motor according to an exemplary embodiment of the present disclosure
  • FIG. 2 is a perspective view of one of the insulators illustrated in FIG. 1 ;
  • FIG. 3 is a perspective view of a peripheral portion of the inner labyrinth structure and the outer labyrinth structure illustrated in FIG. 1 ;
  • FIG. 4 is a vertical cross-section of the inner labyrinth structure illustrated in FIG. 3 ;
  • FIG. 5 is a vertical cross-section of the outer labyrinth structure illustrated in FIG. 4 .
  • a brushless motor 10 includes a motor shaft 12 , a rotor 14 , a stator 16 , a centerpiece 18 , a circuit board 20 , a connecting member 22 , and a board case 24 .
  • the rotor 14 includes a rotor housing 26 and a rotor magnet 28 .
  • the rotor housing 26 includes a circular cylinder shaped shaft bearing housing section 30 provided at the outer radial direction side of the motor shaft 12 , and an bottomed-cylinder shaped outer cylinder section 32 formed at the radial direction outside of the shaft bearing housing section 30 .
  • the rotor magnet 28 is provided at an inner peripheral face of the outer cylinder section 32 .
  • An opening is formed at one axial direction side of the outer cylinder section 32 , and a bottom wall portion 34 is formed at the other radial direction side of the outer cylinder section 32 .
  • the shaft bearing housing section 30 described above extends out from a central portion of the bottom wall portion 34 toward the centerpiece 18 side.
  • Plural vent holes 36 are formed in the bottom wall portion 34 .
  • a pair of shaft bearings 38 are housed in the shaft bearing housing section 30 , and the motor shaft 12 is assembled to the pair of shaft bearings 38 . Both axial direction sides of the shaft bearing housing section 30 are open, and one end of the motor shaft 12 projects out from the shaft bearing housing section 30 toward the centerpiece 18 passing through the opening in one axial direction side of the shaft bearing housing section 30 .
  • the stator 16 includes a stator core 40 , a pair of insulators 42 , 44 , and plural windings 46 .
  • the stator core 40 includes a ring-shaped unit 48 provided at the axial direction outside of the shaft bearing housing section 30 , and plural teeth 50 formed in a radiating pattern at the periphery of the ring-shaped unit 48 .
  • the stator core 40 is housed inside the outer cylinder section 32 , and is disposed between the shaft bearing housing section 30 and the rotor magnet 28 along the radial direction.
  • a penetration hole 54 into which a screw 52 is inserted, is formed in the ring-shaped unit 48 penetrating along the axial direction of the motor shaft 12 .
  • the pair of insulators 42 , 44 are divided along the axial direction of the stator core 40 , and are fixed to the stator core 40 from the both axial direction sides of the stator core 40 .
  • the pair of insulators 42 , 44 each include a ring-shaped insulating portion 56 that covers the ring-shaped unit 48 , and plural teeth insulating portions 58 that cover the respective plural teeth 50 (see FIG. 2 , and FIG. 3 ).
  • the insulator 42 that is disposed at one axial direction side (namely, the centerpiece 18 side) of the stator core 40 is an example of an “insulator” of the present disclosure.
  • the plural windings 46 include plural winding coil sections 60 wound around the teeth 50 and over the teeth insulating portions 58 .
  • the winding coil sections 60 may be wound onto one of the teeth 50 by concentrated winding, or may be wound across plural of the teeth 50 by distributed winding.
  • the centerpiece 18 includes a flat plate shaped main body section 62 .
  • the main body section 62 is disposed facing the opening of the outer cylinder section 32 .
  • a shaft supporting section 64 having a concave shape open at the shaft bearing housing section 30 side, is formed at a central portion of the main body section 62 , and the motor shaft 12 is pushed into the shaft supporting section 64 so as to be supported thereon.
  • a boss 66 projecting toward the stator 16 side along the axial direction of the motor shaft 12 is formed further to the radial direction outside than the shaft supporting section 64 .
  • Plural of the bosses 66 are provided at intervals around the circumferential direction of the motor shaft 12 .
  • a screw hole 68 open at the stator core 40 side, is formed at each of the bosses 66 .
  • the screw hole 68 is formed at a position corresponding to the penetration hole 54 formed at the ring-shaped unit 48 of the stator core 40 described above. Having been inserted through the penetration hole 54 , the screw 52 is screwed into the screw hole 68 such that the stator core 40 is fixed and supported to the main body section 62 .
  • the circuit board 20 is fixed to the side of the main body section 62 opposite to the side of the stator core 40 .
  • An electronic circuit is formed on the circuit board 20 for switching conduction to the plural winding coil sections 60 described above.
  • the connecting member 22 is provided at one side of the main body section 62 .
  • a connecting portion 70 is provided at the connecting member 22 , and a connection terminal provided at the connecting portion 70 is electrically connected to the electronic circuit formed on the circuit board 20 .
  • the board case 24 is formed with a flattened box shape, and is assembled to the main body section 62 at the side of the main body section 62 opposite to the side of the stator core 40 .
  • a housing space 72 is formed between the board case 24 and the main body section 62 , and the circuit board 20 is housed in the housing space 72 .
  • the brushless motor 10 is, for example, suitably employed as a vehicle fan motor, and the motor shaft 12 is fixed to the vehicle body such that the motor shaft 12 is disposed along a horizontal direction.
  • a fan 100 includes a fixing portion 102 provided at a central portion of the fan 100 , and plural blades 104 provided at the periphery of the fixing portion 102 .
  • the fixing portion 102 includes an outer cylinder section 112 and a bottom wall portion 114 , and is fixed to the rotor housing 26 so as to cover the rotor housing 26 .
  • a flow of cooling wind W that cools the winding coil sections 60 through slots formed between the plural teeth 50 is generated.
  • the cooling wind W is expelled toward the outside of the rotor housing 26 through the vent holes 36 formed at the bottom wall portion 34 , and also expelled toward the radial direction outside of the brushless motor 10 between the bottom wall portions 34 , 114 , and between the outer cylinder sections 32 , outer cylinder section 112 , of the fixing portion 102 and rotor housing 26 .
  • the inner labyrinth structure 80 and the outer labyrinth structure 90 are provided at the brushless motor 10 .
  • the inner labyrinth structure 80 is configured by a first water stopping wall 82 and a second water stopping wall 84 that are formed in a ring shape along the circumferential direction of the motor shaft 12 .
  • the first water stopping wall 82 extends out along the axial direction of the motor shaft 12 from the ring-shaped insulating portion 56 formed at one of the pair of insulators 42 , toward the main body section 62 .
  • the second water stopping wall 84 extends out along the axial direction of the motor shaft 12 from the main body section 62 (a peripheral portion of the shaft supporting section 64 ) toward the ring-shaped insulating portion 56 .
  • the first water stopping wall 82 is disposed at the radial direction inside of the second water stopping wall 84 , and the leading end side of the first water stopping wall 82 and the leading end side of the second water stopping wall 84 overlap along the axial direction of the motor shaft 12 .
  • a gap is secured along the radial direction between the first water stopping wall 82 and the second water stopping wall 84 .
  • a leading end portion of the first water stopping wall 82 faces the main body section 62 (the peripheral portion of the shaft supporting section 64 ) along the axial direction of the motor shaft 12 .
  • an extending portion 86 that extends out toward the radial direction outside of the first water stopping wall 82 is formed at the ring-shaped insulating portion 56 , and the leading end portion of the second water stopping wall 84 faces the extending portion 86 along the axial direction of the motor shaft 12 .
  • a radial direction outside end portion 86 A of the extending portion 86 projects further to the radial direction outside of the extending portion 86 than the leading end portion of the second water stopping wall 84 .
  • Respective gaps are secured between the leading end portion of the first water stopping wall 82 and the main body section 62 , and between the leading end portion of the second water stopping wall 84 and the extending portion 86 .
  • the inner labyrinth structure 80 formed by the first water stopping wall 82 and the second water stopping wall 84 is positioned at the radial direction inside of the plural winding coil sections 60 , and more specifically, is positioned between the shaft bearing housing section 30 and the main body section 62 (the peripheral portion of the shaft supporting section 64 ) along the axial direction.
  • the inner labyrinth structure 80 is an example of a labyrinth structure of the present disclosure.
  • the outer labyrinth structure 90 is configured by a third water stopping wall 92 and a fourth water stopping wall 94 formed in a ring shape along the circumferential direction of the motor shaft 12 .
  • the third water stopping wall 92 and the fourth water stopping wall 94 are positioned at the radial direction outside of the first water stopping wall 82 and the second water stopping wall 84 .
  • the third water stopping wall 92 extends out along the axial direction of the motor shaft 12 from the ring-shaped insulating portion 56 formed at one of the pair of insulators 42 , toward the main body section 62 .
  • the fourth water stopping wall 94 extends out along the axial direction of the motor shaft 12 from the main body section 62 , toward the ring-shaped insulating portion 56 .
  • the third water stopping wall 92 is disposed at the radial direction outside of the fourth water stopping wall 94 , and the leading end side of the third water stopping wall 92 and the leading end side of the fourth water stopping wall 94 overlap in the axial direction of the motor shaft 12 .
  • a gap is secured between the third water stopping wall 92 and the fourth water stopping wall 94 along the radial direction.
  • the leading end portion of the third water stopping wall 92 faces the main body section 62 along the axial direction of the motor shaft 12 .
  • the leading end portion of the fourth water stopping wall 94 faces the ring-shaped insulating portion 56 along the axial direction of the motor shaft 12 .
  • Respective spaces are secured between the leading end portion of the third water stopping wall 92 and the main body section 62 , and between the leading end portion of the fourth water stopping wall 94 and the ring-shaped insulating portion 56 .
  • the outer labyrinth structure 90 formed by the third water stopping wall 92 and the fourth water stopping wall 94 is at the radial direction inside of the plural winding coil sections 60 , and is positioned at the radial direction outside of the inner labyrinth structure 80 .
  • the inner labyrinth structure 80 is configured by the first water stopping wall 82 and the second water stopping wall 84 that are formed in a ring shape along the circumferential direction of the motor shaft 12 .
  • the first water stopping wall 82 extends out along the axial direction of the motor shaft 12 from the ring-shaped insulating portion 56 toward the main body section 62
  • the second water stopping wall 84 extends out along the axial direction of the motor shaft 12 from the main body section 62 toward the ring-shaped insulating portion 56 .
  • the inner labyrinth structure 80 is positioned at the radial direction inside of the plural winding coil sections 60 arranged in a ring shape. Accordingly, since the inner labyrinth structure 80 is not disposed on the pathway of the flow of the cooling wind W that cools the winding coil sections 60 and that is expelled toward the radial direction outside of the brushless motor 10 , the flow of the cooling wind W can be suppressed from being hindered by the inner labyrinth structure 80 .
  • the brushless motor 10 according to the exemplary embodiment of the present disclosure can secure cooling of the winding coil sections 60 while suppressing the shaft bearings 38 from being exposed to water.
  • the first water stopping wall 82 is disposed at a closer position to the outer peripheral face of the motor shaft 12 (the outer peripheral face of the motor shaft 12 along which the water droplet L travels) that is liable to become the pathway by which the water droplet L penetrates to the pair of shaft bearings 38 . Accordingly, shaft bearings 38 can be more effectively suppressed from being exposed to water by the first water stopping wall 82 .
  • the water droplet L cannot easily enter the gap between the extending portion 86 and the leading end portion of the second water stopping wall 84 .
  • the water stopping capability of the inner labyrinth structure 80 can thereby be improved.
  • a radial direction outside end portion 86 A of the extending portion 86 projects further toward the radial direction outside of the extending portion 86 than the leading end portion of the second water stopping wall 84 . Accordingly, since the water droplet L can be more effectively hindered at the portion of the extending portion 86 projecting further toward the radial direction outside than the second water stopping wall 84 , this can also improve the water stopping capability of the inner labyrinth structure 80 .
  • the outer labyrinth structure 90 is also provided at the radial direction inside of the plural winding coil sections 60 . Accordingly, the shaft bearings 38 can be even more effectively suppressed from being exposed to water by this two-layer labyrinth structure.
  • the outer labyrinth structure 90 is also positioned at the radial direction inside of the plural winding coil sections 60 arranged in a ring shape. Accordingly, since the outer labyrinth structure 90 is not disposed on the pathway of the flow of the cooling wind W that cools the winding coil sections 60 and that is expelled to toward the radial direction outside of the brushless motor 10 , the flow of the cooling wind W can be suppressed from being hindered by the outer labyrinth structure 90 .
  • the leading end side of the first water stopping wall 82 overlaps with the leading end side of the second water stopping wall 84 along the axial direction of the motor shaft 12 .
  • the water stopping capability of the inner labyrinth structure 80 can thereby be further improved since the flow path inside the inner labyrinth structure 80 bends and the flow path length is increased.
  • the leading end side of the third water stopping wall 92 overlaps with the leading end side of the fourth water stopping wall 94 along the axial direction of the motor shaft 12 .
  • the water stopping capability of the outer labyrinth structure 90 can thereby be further improved since the flow path inside the outer labyrinth structure 90 bends and the flow path length is increased.
  • the brushless motor 10 of the exemplary embodiment of the present disclosure described above is more preferably employed as a vehicle fan motor, the brushless motor 10 may also be employed for applications other than vehicle fan motors.
  • the brushless motor 10 more preferably includes the outer labyrinth structure 90 in addition to the inner labyrinth structure 80 , the outer labyrinth structure 90 may be omitted.
  • first water stopping wall 82 is more preferably disposed at the radial direction inside of the second water stopping wall 84 in the inner labyrinth structure 80
  • first water stopping wall 82 may be disposed at the radial direction outside of the second water stopping wall 84 .
  • the third water stopping wall 92 is disposed at the radial direction outside of the fourth water stopping wall 94 in the outer labyrinth structure 90
  • the third water stopping wall 92 may be disposed at the radial direction inside of the fourth water stopping wall 94 .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
US15/059,309 2015-03-10 2016-03-03 Brushless motor with water stopping walls creating labyrinth structure Active 2036-11-12 US10224777B2 (en)

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JP2015-047252 2015-03-10
JP2015047252A JP6394444B2 (ja) 2015-03-10 2015-03-10 ブラシレスモータ

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180241278A1 (en) * 2015-10-15 2018-08-23 Daikin Industries, Ltd. Electric motor and blower
US11005333B2 (en) * 2015-10-15 2021-05-11 Daikin Industries, Ltd. Electric motor having a stator with a radially outside rotor with the rotor having a fan mounting portion comprising a noncontact region and a contract region configured to contact a mouting surface of a fan

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CN105978211B (zh) 2019-10-01
JP6394444B2 (ja) 2018-09-26
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US20160268863A1 (en) 2016-09-15
JP2016167942A (ja) 2016-09-15

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